Process of producing stippled photographic records.



No Drawing.

to that of a like grained, dotted silver compounds,

vents of the complex ,stippled, grained PROCESS OF PRODUCING STIPPLED PHOTOGRAP-HIC RECORDS.

;To all whom it may concern:

Be it known that I, PAUL LAOHENMEYER, a citizen of the United States, residing at Lansdowne, county of Delaware, State of Pennsylvania, have invented a new and useful Process of Producing Stippled Pho tographic Records, of which the following is a specification.

This invention relates to a process or method of chemically producing a stippled, grained dotted or interrupted image, picture tint, or surface by subjecting silver and existing as a homogeneous surface, and as in a photographic record, to the action of metallic cyanid solutions containing or acting in the presence of solmetallic cyanids. I-Ieretofore it has been possible in practice to produce such an image picture tint, or surface by physical or mechanical. means only, the method being expensive and taking considerable time. i

In my present process by varying the kind of chemicals used and also the relative proportions of the same to each other, a dotted or interrupted image, picture, tint or surface may be produced, consisting of regular or irregular dots, dashes or crystalline forms of varioussizes and shapes, lying isolated or adjacent or touching or overlying one another with the spaces between free of metallic deposits, as the case may be.

The method consists in transforming, transmuting and changing the chemical and physical nature of the image, picture'tint, or surface-("from its then present condition orstippled image, picture, tint or surface.

In carrying out my process a solution of an oxidizing reagent is utilized, and this mixture or solvent matter consists of a solution of a metallic cyanid acting in the presence of an alkali or else in the the complex metallic cyanids. By a solution of metallic cyanid I desire it understood that I may employ ferricyanid of potassium, or other metallic cyanid, by an alkali I mean such alkali as ammonium hydrate and bye solvent of the complex metallic cyanide, I

' mean such a compound as ammomum thiosulfate and I employ preferably ferricyanid of potassium and ammonium hydrate, as these are the chemicals which-I have found to work most energetically, and satisfactorily, although it will of course be under- Specification of Letters Patent. Application filed April'l l. 1910. Serial No. 555,416.

stood that I do .and deposited and interrupted presence of a solyent ofwhich have been tions of metallic salts as of iron,

\ not wish to be limited specifically to these two, as various other chemicals may be used Within the scope of my invention three of which I have specified above as typical.

In carrying out my novel process the chemicals selected are mixed in suitable proportions, such as for example, when used on photographic negatives, I may take 90 cubic centimeters of one and aqueoussolution of ferricyanid of potassium and add thereto 20 cubic centimeters of amni iium hydrate, specific gravity .90, alth ugh it Will be understood that these promay be varied and it being noted proportion of the chemicals one to determines the locality, nature, color, opacity, and number of the stipples or grains and also delength of time necessary to accomplish the change from the original state of the image, picture tint to the other state or condition. The image, picture tint, or surface, upon its support is then treated with the solution or mixture and the resulting action destroys the physical and chemical nature of the constituents of theoriginal image, picture tint or surfaoe,,replacing and portions that the the other, shape, size, dots, dashes, termines the substituting for such constituents other compounds in the shape of regular or irregular dots, dashes, stipples, grains or crystallihe forms. ture of the image,

picture tint, or surface is entirely destroyed,

all of the dots, dashes one-half per cent,

Patented Dec.3,1912.

When the original na-n and the like will have been formed, placed the action is complete. The next step consists of Washin sultant image, picture tint, or sur ace upon its support to remove all the soluble chemicals, which washing may be accomplished" by destroying by chemical means the byproducts of the reaction, then it may found that the dots, stipples and the like formed are not sufliciently opaqueto permit the use of'the grained Image, picture tint, or surface in the com mercial photo engraving and printing arts.

If'it is found that they are not sufiiciently opaque they can be intensified, added to or chemically changed by means of various chemicals that will intensify, add to, or chemically change them to meet the required necessities. I

In. the intensification process acid solucopper or uranium, or alkaline sulfide and various the rephotogra I hie developers may be used and in ave been found to give desirable Other means may be also utilized darken or render the practice results. in order to intensify, dots, etc., opaque, such as rubbing or rolling 1 over the surface various compounds, either '1 1n free powder, solid form or in a mixture i with oily, mediums or as an emulsion or solution. is particularly adapted and intended principally for the production of an image, picture tint or surface to be used in connection with reproductive printing processes, either directly or indirectly.

greasy or waxy The entire method ture, tint or surface which consists in subjecting SIIVGIQ SIlVQI compounds or silver and photographic record, to

silver compounds, existing as a homogeneous" surface, and as in a the. action of a metallic cyanid solution,..

containing or acting in the presence of sol-'- vents of the complex metalliccyanids thereby produced. 7

3. .The process of making astippled,

I grained, dotted or interrupted image, p1cture, tint or surface which consists in subjecting silver, or silver compounds,

"'It will now be apparent that I have devised a novel and useful process embodying the presence of further solvents of the complex metallic compounds thereby produced, 1 then washing the image, picture, tint or surface to remove the soluble chemicals and the the features of advantage enumerated in the statement of invention and the above description, and while I have, in the present instance, shown and described the preferred embodiment thereof which has been found in practice to give satisfactory and reliable re- I suits, it is to be understood that the same is susceptible of modification 1n various particulars Without departing from the spirit 5 or scope of the invention or sacrificing any of its advantages;

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is-: 4

1. The process of making a stippled, grained, dotted or interrupted image, picture, tint or surface \vhich'consists in sub jecting silver, silver compounds, or silver and silver compounds, existing as a homo-ge-' neous surface, and as in a photographic rec- 0rd, to the action of a solution'of an ox1d1z ing reagent containing or acting in the prestallic compounds thereby produced.

2. The process of making a stippled, grained, dotted or interrupted image, picby-products of silver compounds and silver existing as a homogeneous surface, and as in a photographic record. to the action ofa solution of an oxidizing reagent. contalning or acting in the reaction, and then sub jecting the resulting image, picture, tint or I surface to. the action of an intensifying agentcapable of co-mlnmng with nuclel produced in the image, picture, tint or surface to increase their opacity to actinic rays.

4. The process of making a non-homogeneous photographic representation for the purpose stated, which consists in subjecting the exposed homogeneous surface of a coatlng containing metallic compounds, as 1n a photographic record to the 'action of a solution of an oxidizing reagent and to the additional action of solvents of the complex metallic compounds produced by the combination of the metallic salts of the oxidizing 1 reagent solution with the metallic salts of 1 the sensitive solvents of the complex me: 1

coating. PAUL LACI-IENMEYER.

1- Witnesses: I

i i t l C. D. McVAY, M. E. RnvKnNBAcr 

